This Sigma 258101 telephoto macro lens features an HSM (Hyper-Sonic Motor) for fast, efficient autofocus. The f/22 minimum aperture and f/2.8 maximum aperture ensure optimal light gathering.
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I bought this lens because of its macro capabilities. I needed a lens to get up close to objects for my product photography. I discovered that it's great for portraiture as well. It's tack sharp, fast focus and an all around nice lens.